Amy, Bernadette, and Penny are having a girl's night out when Amy is introduced to Zach, one of Penny's ex-flings. Her response surprises everyone at the table, herself included.

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Amy misinterprets the signs and suspects she may have the flu. Sheldon helpfully suggests making a list of symptoms, some of which include, shall we say... localized throbbing.

Sheldon suggests that Amy control her urges through the use of Vulcan mind discipline, which leads to Amy making fun of Star Trek. Sheldon does not appreciate such slurs on his favorite television show.

Amy decides to confront the problem head-on and seeks out Zach at a bar and makes a proposition. Sheldon's response is priceless.